Pipe-coupling.



No. 839,090. PATENTED DB0; 25, 1906. W. P. F. AYBR.

PIPE COUPLING.

APPLICATION PILED JAN. 8, 1906.

. v v /m v 7- y a v I WILLIAM P. F. AYER, or wmcnnsrna, MASSACHUSETTS.

'{lPs-coupuue.

2' Specification of Letters Patent.

ratente'dne i au, 190e Application filed January 8,1906. Serial No.zaaes .1'0 aLLw/wm it may con/cent: Be" it known that l, WILLIAALDIAP.F. AYER, a citizen of the UnitedI'States,--residing in Winchester, inthe county of Middlesex and 5State of Massachusetts, have invented anImprovement in Pipe-Couplings, of which the following description, inconnection with the accompanying drawings, is a specification, likeletterson the drawings representing like parts. U r

The present invention relates to a pipecouplin and is embodied in acoupling of that typein which the two cou ling members are provided withengaging f dces adapt- 5 ed to be drawn into tight contact with eachother by means of a coupling-nut, bolts, or other fastening devices. Incouplin s of this kind it is desirable to use iron, whic is a relativelycheap material, for the coupling 0 members; but in order to preventcorrosion at least one of the two adjoining faces is commonly composed.of non-corrosive metal, such as brass, which is much more expensivethan the cast-iron of which the coupling mem- 5 bers are mainly formed.

The purpose ofthe present invention is to provide one of the couplingmembers with-a non-corrosive engagi surface and at the same time to usethe l east ossible amount 3 of'the'more expensive metal.

p accordance with the invention the ad-- jolnang faces or engaging partsof the two coupli members are correspondingly tap'ered o rounded, so,that a of one cogpling member having an externally-roun outer surfaceprojects into the other couplingmember, the inner surface of l which iscorrespondingly rounded; j One of these surfaces in accordance with'theinven- 4 tion is covered with brass or other hon-cor rosive material,which is in the form of a tube expanded or spun into contact with thesurface and which member beyond the enga ing. surface t ereo the saidcoupling member being provided with a retaining portion, such as anannular groove or channel, into connection with which the non-corrosivemetal is forced, so

as to hold it. firmly in position.

The drawing is a longitudinal section of a pipe-coupling embodying theinvention. herein shown, the coupling membera is provided with aninternal screwethread a, for attachment to a pipe A and constitutes themale member, belng provided with h forin projecting part;

, softer metal, so that a portion thereof would projects into thecoupling" wardly-projecti portion c havin a, tapered or rounde outersurfaceiwhic ,fits a correspondingly-shaped inner surface of thie femalemember I). The said. member b is herein shown as provided withscrew-threads b whichwngage with the threads on a; p1 e B, and a flangeb, which is engaged I) t e shoulder c of the coupling-nut c, Whic enageswithscrew-threads a on the outer sur i ace of the member a. r 6 5 Asthus far described the con ling does'not depart in any essential particuar, except m the rounded shape of the engaging portlons, from thecouplings now common yin use, and it is to be understood that anyequiva-' lent clamping or fastening device may, be I substituted for theclamping-nut c. ,Iniad-v eordance with the invention, however, the

engaging surface of one of the coupling members-m the construction shownthe enga ing surface of the member bis coated a thin layer 1) ofnon-corrosive metal-such, for example, as brass-this surface being inthe form of a tube which is expanded or spun into contact with thesurface to which 1t is connected. In order to hold this supple: mentalsurface ortion firmly in place, the member to which it is connected isrovidod with an engaging portion, herein s own as the annular channel 6in the member I), the tubular surface. portion being spun or expandedinto the said channel, as indicated in the drawings; In the constructionshown the portion 1) is shown. as bent outward, as

by an expanding or spinning process, so as to extend into the channel,it being obvious,

however, that with relatively soft metal the tubular portion might beacted -u on by a suitable tool adapted to draw or thin out the besqueezed outwardly into the channel 6 t'will be seen fromfthe foregoingdescri tion that the non-corrosive. surface of t e cou ling can beprovidedfor with ',=a ver sma l amwint of the more expensive materia a:

a very t tube of such material being all that is necessary to answer thepurpose. Furthermore, the main parts of the couplin members need not bematerially change from the usual form, it being necessary only to supplythe member which carries the non corrosive surface with the shallowannular channel or equivalent retaining ortion to coact with the surfacepart to hol the same position. The rounding of the engaging no surfaces,however, assists in keeping the 1 a member \"-ilh i with a forwardlppmcouphng tight ii the plpe Should bend or sag 0 ;L1ng rounded surfuee, asecond mmnhvx' at the 1m. 1 havlng :m nmer rounded suvinvo, in 'hi theWhat I c1a1n11s first-named sm'ineo and having :Llsu nu annu- 5 1. In aplpe-eouphng, the combnmtwn lar channel, and, a tubular IluH-afUllflSlVQ2o Wlfih the member a, provlded Wlth the formmnbcr spun 11110 Contact"1111 mm] mm! wardly-prqectmg rounded surface a; of the rounded surimaeand nmmlm L'hunnviv memberbhavmg an lnner rounded surface to in(ieshnwny whereof l have mggnecl my fit the surface a; the tubularI10l1-001L\';S)V 2 name (.0 Hus speulhcnhm'l m U10 )l( --(ll(( Ur 10surface portlon b; and the annular channel '1 hm suhsvrxlmlg wltnvssvsnb the tubu1ar,n0nc0rros1ve surfacelfi b01119 w? v HILL-U1 1.1. U Ml spunmto contact wlth smd mner round-2d surface and sad annular clmnneleb,substaw 1 many as desc'nbed. 3 f e (,m'lmm,

15 2. In a p1pe-couplmg, "Uhe combnmtmn 01" H. J4 Lxxmmxmma.

